<!--
 * @Author: Mr.Song
 * @Date: 2020-07-27 16:02:49
 * @LastEditTime: 2020-07-27 16:17:10
 * @Description: 
-->
<template>
  <div class="nav-bar" :class="{ is_fixed: isFixed }">
    <div class="container">
      <div class="pro-title">
        {{ title }}
      </div>
      <div class="pro-param">
        <a href="javascript:;">概述</a><span>|</span>
        <a href="javascript:;">参数</a><span>|</span>
        <a href="javascript:;">用户评价</a>
        <slot name="buy"></slot>
      </div>
    </div>
  </div>
</template>
<script>
export default {
  name: "nav-bar",
  props: {
    title: String
  },
  data() {
    return {
        isFixed:false
    };
  },
  mounted() {
      window.addEventListener('scroll',this.initHeight)
  },
  methods: {
      initHeight(){
          let scrolTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop
          this.isFixed = scrolTop > 152 ? true:false
      },
  },
  destroyed() {
        window.removeEventListener('scroll',this.initHeight,false)  
  },
};
</script>
<style lang="scss" scoped>
@import "../assets/scss/config.scss";
@import "../assets/scss/mixin.scss";
.nav-bar {
  height: 70px;
  line-height: 70px;
  border-top: 1px solid $colorH;
  background-color: $colorG;
  z-index: 10;
  &.is_fixed {
    position: fixed;
    top: 0;
    width: 100%;
    box-shadow: 0 5px 5px $colorE;
  }
  .container {
    @include flex();
    .pro-title {
      font-size: $fontH;
      color: $colorB;
      font-weight: bold;
    }
    .pro-param {
      font-size: $fontJ;
      span {
        margin: 0 10px;
      }
      a {
        color: $colorC;
      }
    }
  }
}
</style>
